Abstract
We report effective mass () measurements, via analyzing the temperature dependence of the Shubnikov–de Haas oscillations, for dilute, interacting, two-dimensional electron systems (2DESs) occupying a single conduction-band valley in AlAs quantum wells. When the 2DES is partially spin-polarized, is larger than its band value, consistent with previous results on various 2DESs. However, as we fully spin-polarize the 2DES by subjecting it to strong parallel magnetic fields, is unexpectedly suppressed and falls even below the band mass.
- Received 19 September 2007
DOI:https://doi.org/10.1103/PhysRevLett.101.026402
©2008 American Physical Society